Marine heave compensating device and winch drive
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United States of America Patent
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N/A
Issued Date -
Jun 12, 2003
app pub date -
Sep 30, 2002
filing date -
Dec 10, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A winch for use in a heave compensation system has a winch drum (42) driven by an AC asynchronous motor (50) via a gearbox (52). The motor (50) is controlled by a variable speed control (58) as a function of heave speed. The motor (50) and its drive train, and the winch (42), are chosen to have low inertia. The winch pays out and reels in to compensate for heave substantially instantaneously, without the need for prediction of wave patterns.
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